Study On Unproppant Waterfrac Mechanism

Hydraulic technology was vast applied in low permeability oil-gas field exploiting and development, and gained extremely economic benefit. In hydraulic technologies, the effectiveness of fracture is the dominant factor. for quite some time, hydraulic fracture continuous surround how to enhance fracture effectiveness, decrease the prop fracture damage result from remnant. Recent year, foreign countries have successed applied waterfrac in low permeability oil-gas field and practiced lots of experiments and theory study, the results indicated it is better than traditional hydraulic fracture, and cost less than traditional treatment.This article is study on the questions of unproppant waterfrac. Firstly, study on analysis of the mechanism of waterfrac. combined stimulation software result with the experiment result, establish stimulation model based on layers' information. Stimulate the hydraulic fracture open and close during the fracture procedure, analysis the dynamic changement when fractured and explain it. Study on the result and give the Young's modulus limit; figure out the effect of fracture orientation; quantitative analysis the fracture displacement under vary conditions; apply fractal theory to simply fracture roughness calculation, calculate fracture conductivity; analysis the factors which effect conductivity by multiple regression; compare experiment result with theoretic result. According to layer permeability, fracture length, fracture width and conductivity calculating dimensionless conductivity and to judge whether the layer is fit for unproppant waterfrac.